obama needs to avoid being irritable. >> but he's got to relax. he's got to show it, and he's got to show a little sense of humor. he's got to show why he's likable. >> reporter: the debate is set for 90 minutes on wednesday night. it's all on domestic issues. the first half, jobs and the economy. the second half, health care and other domestic issues. david? >> david kerley in washington tonight. david, thanks very much. >>> i want to bring in abc news political analyst matt dowd who has advised both republican and democratic campaigns. matt, as always, it's great to have you with us. >> great to be here, david. >> you have three things for everyone to watch for. one of the things you point out, body language could have a bigger impact than words, and we remember al gore, george bush and jon stewart having a field day with those sighs. >> i've had a record of that in texas. >> as if the sighing weren't bad enough, gore's behavior got worse. [ laughter ] >> in that same year we remember that moment when al gore got up, walked over towards then gov